Count Eustache III of Boulogne

Count Eustache III of Boulogne (1055-1125) was the Count of Boulogne from 1087 to 1125, succeeding Count Eustache II of Boulogne and preceding Countess Mathilde of Boulogne. He was the brother of kings Godfrey de Bouillon and Baldwin I of Jerusalem and father of Queen of England Mathilde (Matilda).

Biography
Eustache was born in 1055, the son of Count Eustache II of Boulogne and Countess Ida of Lorraine. His father was a companion of William the Conqueror at the Battle of Hastings in 1066, and Eustace became a vassal of England when he acceded to the Count of Boulogne in 1087 on his father's death. A year later, he supported the rebellion of Robert of Normandy against William II of England. In 1096, Eustache embarked on the First Crusade with his brothers Godfrey de Bouillon and the future Baldwin I of Jerusalem, and he returned to Europe to manage his domains after the end of the crusade in 1099. He married Mary Dunkeld, the daughter of Malcolm III of Scotland, and he became a member of the high nobility. In 1118, when his brother Baldwin I died, he was offered the throne, but distant relative Baldwin of Bourcq was crowned as Baldwin II of Jerusalem before Eustache could arrived. In 1125, Eustache died and his daughter succeeded him.